// 初始化列表
#include <iostream>
#include <string>
using namespace std;
class Person { 
public:
    int m_age;
    string m_name; 
    // 初始化列表
    Person():m_age(20), m_name("lxy"){}
    Person(int age, string name):m_age(age), m_name(name){}

};
int main(void) {
    Person p1;
    cout << p1.m_age << p1.m_name << endl;

    return 0;
}